# Polars 1.32.3 — Python Polars 1.32.3

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2025-08-14
- Version: 1.32.3
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.32.3
- Permalink: https://whatsnew.fyi/product/polars/releases/1.32.3

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Lower .sort(maintain_order=True).head() to streaming top_k
- **changed** — Lower top-k to streaming engine
- **changed** — Allow order pass through Filters and relax to row-separable instead of elementwise
- **added** — Add native streaming for peaks_min and peaks_max
- **changed** — IR graph arrows, monospace font, box nodes
- **added** — Add DataTypeExpr.default_value
- **changed** — Lower rle to a native streaming engine node
- **added** — Add support for Int128 to pyo3-polars
- **fixed** — Scan of multiple sources with null datatype
- **fixed** — Categorical in nested data in row encoding
- **fixed** — Missing length update in builder for pl.Array repetition
- **fixed** — Race condition in global categories init
- **fixed** — Error when using named functions
- **fixed** — Don't encode entire CategoricalMapping when going to Arrow
- **fixed** — Fix cast on arithmetic with lit
- **fixed** — Incorrect slice-slice pushdown
- **fixed** — Dedup common cache subplan in IR graph
- **fixed** — Allow join on Decimal in in-memory engine
- **fixed** — Fix datatypes for eval.list in aggregation context
- **fixed** — Allocator capsule fallback panic

##### 🚀 Performance improvements

- Lower .sort(maintain\_order=True).head() to streaming top\_k (#24014)
- Lower top-k to streaming engine (#23979)
- Allow order pass through Filters and relax to row-seperable instead of elementwise (#23969)

##### ✨ Enhancements

- Add native streaming for `peaks_{min,max}` (#24039)
- IR graph arrows, monospace font, box nodes (#24021)
- Add `DataTypeExpr.default_value` (#23973)
- Lower `rle` to a native streaming engine node (#23929)
- Add support for `Int128` to pyo3-polars (#23959)

##### 🐞 Bug fixes

- Scan of multiple sources with `null` datatype (#24065)
- Categorical in nested data in row encoding (#24051)
- Missing length update in builder for pl.Array repetition (#24055)
- Race condition in global categories init (#24045)
- Revert "fix: Don't encode entire CategoricalMapping when going to Arrow (#24036)" (#24044)
- Error when using named functions (#24041)
- Don't encode entire CategoricalMapping when going to Arrow (#24036)
- Fix cast on arithmetic with `lit` (#23941)
- Incorrect slice-slice pushdown (#24032)
- Dedup common cache subplan in IR graph (#24028)
- Allow join on Decimal in in-memory engine (#24026)
- Fix datatypes for `eval.list` in aggregation context (#23911)
- Allocator capsule fallback panic (#24022)
- Accept another zlib "magic header" file signature (#24013)
- Fix `truediv` dtypes so `cast` in `list.eval` is not dropped (#23936)
- Don't reuse cached `return_dtype` for expanded map expressions (#24010)
- Cache id is not a valid dot node id (#24005)
- Align `map_elements` with and without `return_dtype` (#24007)
- Fix column dtype lifetime for `csv_write` segfault on `Categorical` (#23986)
- Allow serializing `LazyGroupBy.map_groups` (#23964)
- Correct allocator name in `PyCapsule` (#23968)
- Mismatched types for `write` function for windows (#23915)
- Fix `unpivot` panic when `index=` column not found (#23958)

##### 📖 Documentation

- Fix a typo in "lazy/execution" user-guide page (#23983)

##### 🛠️ Other improvements

- Update pyo3-polars versions (#24031)
- Remove insert\_error\_function (#24023)
- Remove cache hits, clean up in-mem prefill (#24019)
- Use .venv instead of venv in pyo3-polars examples (#24024)
- Fix test failing mypy (#24017)
- Remove outdated comment (#23998)
- Add a `_plr.pyi` to remove `mypy` issues (#23970)
- Don't define CountStar as dyn OptimizationRule (#23976)
- Rename `atol` and `rtol` to `abs_tol` and `rel_tol` (#23961)
- Introduce `Row{Encode,Decode}` as FunctionExpr (#23933)
- Dispatch through `pl.map_batches` and `AnonymousColumnsUdf` (#23867)

Thank you to all our contributors for making this release possible!
@JakubValtar, @Kevin-Patyk, @borchero, @cmdlineluser, @coastalwhite, @iishutov, @jarondl, @kdn36, @orlp, @rawhuul, @ritchie46 and @stijnherfst